Rotary pump



Sept. 4, 1928.

F. c. PETERSON ROTARY PUMP Filed y 1927 3 Sheets-Sheet II C. fezmolz Sept. 4, 1928. 1,683,143

F. c. PETERSON ROTARY PUM P Fil May 192? s Sheets-Sheet 2 Inventor @Mw/ih Azmrney Patented Sept. 4, 1928.

UNITED STATES FRANCIS G. PETERSON, OF EVERETT, WABHINGTOFT.

ROTARY PUMR Application filed May 7,

The present invention relates to rotary pumps designed to pump either gas or li ui The prime object of the invention resides in the provision of a pump'whlch includes a cylindrical stator shell or caslng having an inlet and an outlet and containing an cecentrically mounted cylindrical rotor wlth a plurality of oscillating vanes, blades, or impellers, which are 0 erable upon the rotation of the rotor to raw in gas or liquid through the inlet and to expel the same through the outlet. t

One of the important ob]ects of the nvention lies in the provision of a more simplified and efficient construction that is shown in my co-pending application, Serial No. 161,352, filed on January 15, 1927, and patented October 11, 1927, No. 1,645,069

Another very important ob ect of the 1nvention lies in the provision of an improved structure whereby the same may be more efficiently lubricated.

A still further very important ob ect of the invention lies in the provision of a device which is thoroughly reliable in its operation and otherwise well adapted to the purpose for which it is designed.

With the above and numerous other objects in view as will appear as the description proceeds, the invention resides 1n certain novel features of construction, and in the combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the drawing:

Figure l is a side elevation of the ump embodying the features of this invention,

Figure 2 is an end elevation thereof showing one of the heads removed and a portion of the shell or casing in section,

Fi re 3 is a vertical section taken substantially on the line 33 of Figure 1,

Figure 4 is a vertical section taken substantially on the line 4-4 of Figure 2,

Figure 5 is a perspective view of one of the pistons,

Figure 6 is a perspective view of one of the wear strips,

Figure 7 is a sectional elevation of one of the roller and axle assemblies,

Figure 8 is a perspective view of one of the tension rings.

Referring to the drawing in detail it will be seen that 5 denotes a cylindrical stator casingor shell having an outlet 6 and an 1927. Serial No. 189,575.

inlet 7. The outlet and inlet are disposed tangentially to the axis of the casing or shell and the former is at the to thereof and the latter at the bottom. T is cylindrical stator casing or shell 5 is preferably mounted on a suitable supporting or pedestal structure 8 and has 0 lindrical heads 9 and 10 which are provi ed with eccentric openings or bearings for rotatably receiving a shaft 11 which will' be driven in any suitable manner such as by a prime mover 20. On the shaft 11 and keyed thereto within the cylindrical stator casing or shell 5 is the rotor or cylindrical piston 12 having peripheral compartments 14, the bottoms or inner surfaces of which are curved on arcs eccentric to the periphery of the cylindrical stator casing or shell 5 and have arcuate end walls 15 and arcuate end walls 16, the latter being larger than the former and curved on larger radii. Axles 17 are journalled through the piston 12 to extend through the bottom or inner portions of the compartments 14 and are concentrically arranged about the shaft 11. On one end of each axle 17 there is integral] formed or otherwise fixed a roller 18 while the other end of the axle is reduced and threaded as is indicated at 19 for threadedly receiving another roller 21. Vanes or blades V are mounted in the compartments 14. The structure of each vane V is disclosed to advantage in Figure 5 comprising a shank 22 terminating at one end in a sleeve 23 through which the adjacent axle 17 will extend and the other end of the shank 22 terminates in an arcuate laterally extending head 24 having a rounded extremity 25. At the juncture of the head 24 with the shank 22 there is formed a groove 26 for receiving a wear strip 27 which will engage the interior surface of the stator shell or casing 5. The rounded end 25 engages in the end 15 of the piston 12. The wall 16 is provided with a groove 29 for receiving the wear plate 30 which engages the shank of the vane.

A pair of track rings 35 are disposed in the casing 5 one adjacent head 10 and the other adjacent head 9 and the piston rotates therebetween. These rings 35 have eccentric openings the peripheries of which are en gaged by the rollers 18 and 21. Spring tension rings 36 are disposed about the shaft 11 and engage the rollers 18 and 21 to hold them in engagement with the peripheries of the rings 35. Grease gun nipples 40 and 41 are mounted in the heads 9 and 10 respectively and grease may thereby be forced into the inside of the casing to lubricate the movable parts therein and also lubricate the bearings of the shaft 11.

An appreciation of the operation of the pum may be understood best by referring to Figures 2 and 3, and presuming the piston 12 to be rotated in a counterclockwise direction so that the water or gas which will be trapped in front of the blade or vane passing by the inlet 7 will be carried about. in a counter-clockwise direction and expelled through the outlet 6 as will be quite apparent. The openings in the rings 35 are concentric with the interior periphery of the stator casing but eccentric in relation to the shaft 11 and therefore the pistons are always held in engagement with the interior periphery of the stator and the rollers are held outwardly by the spring ring 36.

It will be readily appreciated that this construction is more simple, cheaper to manufacture, and more ellicient and reliable than the structure shown in my co-pending application heretofore referred to. The present embodiment of the invention, however, has been disclosed in detail merely by way of example since in actual practice it attains the features of advantage enumerated as desirable in the statement of the invention and the above description. It will be apparent that changes in the detail of construction, and in the combination and arrangement of parts may be resorted to without departing from the spirit or scope ofthc invention as hereinafter claimed or sacrificing any of its advantages.

Having thus described my invention, what I claim as new is 1. In a pump, a cylindrical stator casing or shell having an outlet and an inlet, cylinder heads for the casing, a cylindrical piston in the casing, means for mounting the piston eccentrically in the casing, said piston having peripheral compartments, impellers mounted in said compartments, axles journalled through said impellers, rollers on the axles, rings in the casing one on each side of the piston to hold the impellers against axial movement and having openings concentric with the casing, and means engaging the rollers to hold them in engagement with the peripheries of the openings of the rings.

2. In a pump, a cylindrical stator casing or shell having an outlet and an inlet, cylinder heads for the casing, a cylindrical piston in the casing, means for mounting the piston eccentrically in the casing, piston having peripheral compartments, impellers mounted in said compartments, axles journalled through said impellers, rollers on the axles, rings in the casing one on each side of the piston to hold the impellers against axial movement and having openings concentric with the casing, and means engaging the rollers to hold them in engagement with the peripheries of the openings of the rings, said last mentioned means being in the form of a tension ring disposed about the axis of the piston.

3. In a pump, a cylindrical stator casing or shell having an outlet and an inlet, cylinder heads for the casing, a cylindrical piston in the casing, means for mounting the piston eccentrically in the casing, said piston having peripheral compartments, impellers mounted in said'compartments, axles journalled through the impellers and having rollers fixed at one end and rollers detachably mounted at their other end, rings mounted in the casing one to each side of the piston, said rings bein provided with open? ings concentric with the interior periphery of the casing, and means for engaging the rollers to hold them in engagement with the periphery of the openings of the rings.

4. In a pump, a cylindrical-stator casing or shell having an outlet and an inlet, cylinder heads for the casing, a cylindrical piston in the casing, means for mountin the piston eccentrically in the casing, said piston having peripheral compartments, impellers mounted in said compartments, axles journalled through the impellers and having rollers fixed at one end and rollers detach-' ably mounted at their other end, rings mounted in the casing one to each side of the piston, said rings being provided with openings concentric with the interior periphery of the casing, and means for engaging the rollers to hold them in engagement with the periphery of the openings of the rings, said means comprising tension rings.

5. In a pump, a cylindrical stator casing or shell having an outlet and an inlet, cylinder heads for the casing, a cylindrical piston in the casing, means for mounting the piston eccentrically in the casing, said piston having peripheral compartments, impellers mounted in said compartments, axles journalled through the impellers and having rollers fixed at one end and rollers detachabl mounted at their other end, rings mounted in the casing one to each side of the piston, said rings being provided with openings concentric with the interior periphery of the casing, and means for engaging the rollers to hold them in engagement with the periphery of the openings of the rings, said means comprising tension rings, each compartment having a rounded end Wall, each impeller having a shank in which the axle is journalled and a. laterally extending arcuate head terminating in a rounded end engageable in the rounded end wall of the compartment.

In testimony whereof I afiix m signature.

FRANCIS C. PE ERSON. 

